Quarterly report pursuant to Section 13 or 15(d)

Revenue - Narrative (Details)

v3.8.0.1
Revenue - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue from contract costs (percentage) 5.00%
Capitalized precontract cost $ 8.4
Revenue recognized included in contract liability balance 3.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation 356.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 398.6